If P(A∣B)=xP(A|B) = xP(A∣B)=x and P(B∣A)=yP(B|A) = yP(B∣A)=y, what is P(A)/P(B)P(A)/P(B)P(A)/P(B)?
x/yx/yx/y
y/xy/xy/x
xyxyxy
1/(xy)1/(xy)1/(xy)